76 Mb Fiber Connection With slow speeds of 2.5Mbs

I moved over to Plusnet from BT about 2.5 months ago and to be honest I'm regretting it massively, this is the 3rd time I'm getting my 80mb connection down to below 3mb, came home again today to find it the same and no speeds,

I have spent 15 years in IT so I have tried all the usual and know its not on my end, also in 7 years with BT not a single issues with speeds, had same infinity for 2 years with out a single speed issue, I have tried multiple routers and connections, Im on an NT5E faceplate and I have checked it and its all correct

Im looking for some answers on this otherwise I'm going to go for breach of contract as I have had enough, 2mb out of 78 is not acceptable

See attached current info and speed, Note I had just swapped the routers over to test when taking this hens the low connection time.